Hadith 1:648

Narrated Az-Zuhn:

Anas bin Malik Al-Ansari, told me, "Abu Bakr used to lead the people
in prayer during the fatal illness of the Prophet till it was Monday.
When the people aligned (in rows) for the prayer the Prophet lifted
the curtain of his house and started looking at us and was standing at
that time. His face was (glittering) like a page of the Qur'an and he
smiled cheerfully. We were about to be put to trial for the pleasure
of seeing the Prophet, Abu Bakr retreated to join the row as he
thought that the Prophet would lead the prayer. The Prophet beckoned
us to complete the prayer and he let the curtain fall. On the same day
he died."